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Last year, Aaron Rodgers accounted for about 7 percent of the Green Bay Packers' 2012 adjusted salary cap. This year, the team's quarterback is scheduled to account for about 8 percent, and in 2014 that will go up about one more percentage point.

But the Packers almost surely will extend Rodgers' contract before it runs out after the 2014 season, and possibly even as early as this spring or summer. Rodgers' percentage of the cap could double.

This year, for instance, Peyton Manning will take up about 16 percent of the Denver Broncos' salary cap. When Manning was quarterback for the Indianapolis ...